Which type of DTD declaration is this code an example of?

The purpose of an XML schema is to define the building blocks of an XML document. Which option best describes the building blocks of an XML document?

An XHTML document type definition (DTD) describes the allowed syntax and grammar of XHTML markup. Which is not one of the formal DTDs used in XHTML 1.0?

The readyState property holds the status of the XMLHttpRequest. Which is NOT a valid status?

You are working with an XML document that uses an XML schema. How do you ensure that an attribute must be specified for its corresponding element?

What is the correct syntax for comments in XQuery?

in an XML document does what?

In its current state, XML is meant to be a replacement for HTML.

What does an XML document have?

Which appear first in a DTD?

What is XHTML's primary intended use?